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Note 5 - Line of Credit and Long-term Debt (Details Textual) - Wells Fargo Bank, N.A. [Member] - USD ($)
$ in Thousands
3 Months Ended
Oct. 25, 2018
Mar. 31, 2020
Dec. 31, 2019
Term Loan [Member]      
Long-term Debt, Total   $ 15,900  
Term Loan [Member]      
Debt Instrument, Face Amount   15,900  
Long-term Debt, Monthly Repayment of Principal   300  
Long-term Debt, Total   $ 15,879  
Debt Instrument, Covenant, Maximum Debt Percentage of Securing Property   60.00%  
Debt Instrument, Covenant, Repayment Percentage of Excess Cash Flow   20.00%  
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Term Loan [Member]      
Debt Instrument, Basis Spread on Variable Rate   2.00%  
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Term Loan [Member]      
Debt Instrument, Basis Spread on Variable Rate   2.50%  
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 74,000  
Maximum Senior Leverage Ratio   3  
Minimum Fixed Charge Coverage Ratio   1.1  
Long-term Line of Credit, Total   $ 0 $ 0
Line of Credit Facility, Remaining Borrowing Capacity   $ 60,400  
Debt, Weighted Average Interest Rate   3.04% 3.43%
Revolving Credit Facility [Member] | Minimum [Member]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%    
Revolving Credit Facility [Member] | Maximum [Member]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.375%    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument, Basis Spread on Variable Rate 1.50%    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]      
Debt Instrument, Basis Spread on Variable Rate 2.00%